Intelligent fiber differential protection synchronization method based on Beidou time service

Abstract

The invention belongs to the technical field of electric power automation, and concretely relates to an intelligent fiber differential protection synchronization method based on Beidou time service. The method includes the steps: a Beidou signal reception device receives a Beidou time service signal; a protection device uses the signal as a re-sampling pulse to realize re-sampling of multiple samples and interpolation calculation, and then synchronization of protected sampling data is completed; and when normally receiving the Beidou signal, the protection device calculates the transmission time of synchronous data in a fiber by utilizing an accurate absolute marker of Beidou clock synchronization. If the protection device cannot receive the time service signal and a synchronization mode is switched to a conventional synchronization mode, the time service signal of a Beidou satellite serves as a fiber differential protection synchronous signal to solve the problems of inaccurate synchronization and information security. Therefore, the synchronization precision is increased, and synchronization errors of the conventional synchronization mode due to imbalance of fiber channel transmit-receive time delays are avoided.

Description

technical field [0001] The invention belongs to the technical field of electric power automation, and relates to an intelligent optical fiber differential protection synchronization method based on Beidou timing service. Background technique [0002] Optical fiber differential protection has the advantages of simple principle, high reliability, and rapid action. In order to ensure the correct operation of the differential protection, the control system needs to obtain the instantaneous sampling data at both ends of the line at the same time. Whether the data is the sampling value at the same time has a great impact on whether the differential protection can operate correctly. Therefore, the synchronization problem on both sides of the line is an important problem that needs to be solved. [0003] The second-generation Beidou satellite system is a satellite navigation and time synchronization system similar to the American GPS and Russian GLONASS. It is the first independent...

AI Technical Summary

Problems solved by technology

The accuracy of this method can basically meet the requirements, but GPS is controlled by the US military, and has the technology of partially shielding GPS signals, so that its usability and timing accuracy are subject to the US GPS policy, and information security cannot be guaranteed.

At the same time, although GPS can cover the whole world in name, due to the low orbit and large shading angle, GPS signals are easily blocked by objects in mountainous areas or cities; and the accuracy of GPS signals is closely related to the number of received satellites, the connected satellites less accurate

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